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Farmall & IHC Tractors Discussion Forum
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help with loader hydraulics

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thoughthound

03-30-2007 12:03:15




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I got a loader for free--can't pass that up. I was told it worked when it was last used about a year ago. It has sat outside.

It came off an H and I put it on my 400.

I have two problems.

The first is that I cant get the plugs out of 3 of the side hydraulic ports on the tractor. I've applied liquid wrench every day for three days but they are not moving.

Secondly, when I connect the lift pistons, only one piston moves, and only about 8 inches. There seems to be no leaks and the resevoir is full.

Is the lack of movement due to:
-the fact that both hoses are not connected simultaneously?
-bad seals in the pistons?
-air in the hydraulic system?
-other?

Thanks in advance for any assistance.

David

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Ronald

03-31-2007 12:14:50




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 Re: help with loader hydraulics in reply to thoughthound, 03-30-2007 12:03:15  
If your loader is a # 30 or 31 which was very common on an H or M, the cylinders may not be two way. Orginally one hose went to liftall port and the other hose just went to the top of the tank as a return. If you hook the other line to a pressure port and it is not two way it will probable blow the seal out of the top of the cylinder.
Ronald



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Jossette

03-30-2007 15:52:06




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 Re: help with loader hydraulics in reply to thoughthound, 03-30-2007 12:03:15  
If it were me, I would get new couplers for the tractor and loader ports. Better off in the long run.

If you hook up the cylinders with one hose, the other port on the cylinder needs to be cracked open a little for oil and air release or hooked up to the tractor.

Make sure your hydraulic switches are switched to double acting also..



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JayWalt

03-30-2007 13:03:22




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 Re: help with loader hydraulics in reply to thoughthound, 03-30-2007 12:03:15  
I would remove each cylinder and manually extend it. If you cant, something is wrong with the cylinder mechanically. If they move out, then the piston seals are probably worn and need replaced. Air in the hoses/cylinders will still allow the cylinders to move, but it might take 5 or 10 seconds for the air to compress to the point its able to lift the loader. It will also make for a bouncy loader.

As for getting the plugs out, well, make sure theres no paint covering the plug so the lube can penetrate. I would advise againt a torch as it could ruin the seals internally. a little heat wont hurt, but dont go crazy with a torch.


Not sure what u mean by both hoses?
Are the cylinders 2 way? (2 hoses on each cylinder) If they are, only connecting one hose should still allow the cylinder to move one way, but not the over (if the other port is able to breathe).

Also, what shape are the rods in? If they are rusty, and the cylinders are 2 way, rebuilding them is gonna require getting new rods, which is quite $$$ The rusty rods will ruin the new outer seal very rapidly and it will leak like all heack. If the cylinders are one way, then a little rusty rod is of little consequence, as the rod seal is just a wiper and even if it get worn out, it only wipes any excess fluid off the rod that gets past the piston seal. with a 2 way, the seal holds hydraulic pressure is is very sensitive to damaged/rusty rods

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thoughthound

03-31-2007 05:31:22




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 Re: help with loader hydraulics in reply to JayWalt, 03-30-2007 13:03:22  
Each cylinder does have two hoses.

It occurred to me that since only one hose has been connected at a time, that if air is trapped, it really has no place to go, so it wouldn"t work its way out.

I am going to try to get those other ports opened and barring that, just to move it, I"ll bleed the free hose and cycle the fluid a bit.



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